#5FA2CC

CSS

:root {
  --sub-zero: #5fa2cc;
  --sub-zero-rgb: 95 162 204;
  --sub-zero-oklch: oklch(0.684 0.092 237.7);
}

.element {
  color: var(--sub-zero);
  background-color: hsl(203 52% 59%);
  border-color: oklch(0.684 0.092 237.7);
}

Tailwind CSS v4

@theme {
  --color-sub-zero: #5fa2cc;
  --color-sub-zero-50: #def9ff;
  --color-sub-zero-100: #cdedff;
  --color-sub-zero-200: #b1daf8;
  --color-sub-zero-300: #8cbee2;
  --color-sub-zero-400: #68a7cf;
  --color-sub-zero-500: #438fbc;
  --color-sub-zero-600: #3a799f;
  --color-sub-zero-700: #2e617f;
  --color-sub-zero-800: #1e475e;
  --color-sub-zero-900: #143142;
  --color-sub-zero-950: #051d2a;
}

SCSS

$sub-zero: #5fa2cc;
$sub-zero-rgb: 95, 162, 204;
$sub-zero-light: mix(#fff, $sub-zero, 20%);
$sub-zero-dark: mix(#000, $sub-zero, 20%);

.element {
  color: $sub-zero;
  box-shadow: 0 0 0 2px rgba($sub-zero, 0.35);
}